Cooling means for motors.



A. F. ROOKWBLL.

COOLING MEANS FOR MOTORS.

APPLIOATIQN ,FILED rBB.5,19os.

962,250. Patented June 2, E910.

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A. P. ROCKWBLL.

COOLING MEANS FOR MOTORS.

. APPLICATION FILED rm.5,19o 962,250, Patented June 21, 1910.

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,ALBERT F. ROCKWELL, OF BRISTOIJ, CONNECTICUT, ASSIGNOR TO THE NEW DEPARTURE MANUFACTURING COMPANY, F BRISTOL, CONNECTICUT, A`CORPORATI0N OF CON- Specification of Letters Patent. ,l Patented June 21, 1910.

Application led February 5, 1906. -Serial No. 299,611...4

To fmay concern:

JL Beit known that I, ALBERT F. Rooxwnnn,

afcitizen 'of the United States, residing at Bristoh county of Hartford, State of Gon- 3 necticut, have invented a certain new and 'useful Cooling Means for Motors, of which the following is a full, clear, and exact descripltion, such, as will enable others skilled int e art, towhi'ch it appertains to make 0 Aand use the same, reference being had to the accompanying drawings, forming part of this specification.

.Th1s invention relates to air cooled motors and one of the objects thereof is to provide means for cooling the exterior as well as the interior ofthe cylinder, v'

' Another object of the inv'ention is to provide means for distributing the air around the entire active part of the cylinder, that ,o is, the part surrounding the combustion chamber. l Another object isvto provide means whereby the air will be caused to pass around the cylinder and then 4into it. 251-: A further object 'of the invention is to rovide an etlicient means for scavenging the interior portion of the cylinderso as to remove extraneous matter from the motor cylinder as well as .to assist in causing the V heatto pass from the combustion chamber.

Moreover I aim to provide means for maintaining an eicient circulation of air around the` piston cylinder whereby the temperature ofthe cylinder will at no time become excessive.

" Another object of my invent-ion is to provideajacket around the cylinder which will remain closed durin is entering the com ustion chamberof the cylinder and open only-when the combust1on chamber is closed. In like manner the communication between the source of air sup lyand. the combustion chamber will be cut off during the time that the casing 41s the communication being effective onl when the casing is closed.

-' ther objects and advantages of this in- .vention'aas well as the novel details of construction thereof will vbe specifically described hereinaftenit being understood vthat changes in form, proportion and minor details of- Y construction may be resorted .to without departing from the spirit of the 1n- '.vention or sacrificing any of the advantages Y" thereof. f' i the time that the air In order to illustrate the invention I have shown a simple form of mechanism whereby the desired result may be accomplished in which- .Figure I is a vertical, longitudinal, sectional View through an explosive motor cylinder, a `pump and appurtenances coperating therewith. Figure II is a cross. sectional view on the line a-a looking in the direction of the arrow and Fig. III is a cross sectional view `on the line b-b of Fig.

I looking in the direction of the arrow.

` The cylinder 1 of .the motor is provided with an air inlet opening 2 normally closed by a` spring retained check valve 3. Surrounding the'cylinder 1 isa casing or jacket 4, which jacket is closed with respect to the outside atmosphere except through an opening 5 which is normally closed by a spring pressed check valve 6, held in the valve yoke 6 carried by the casing 4. The valve 6 is provided with a tubular stem 8 to receive the stem 9 of the valve 3, these valves being larranged to open and close alternately as will be explained hereinafter. the casing 4 is a pump cylinder 10 in which is a pump piston 11. In the present in- ,stance I have illustrated the pump piston as being o f the reciprocatorv type and connected to the crank shaft 12 of the motor where the crank shaft recelves'communication from the piston 13 of the motor through the medium of a piston rod 14. At an intermediate point within the casing is a perforated ring 15 arranged adjacent to the openings 16 and 17 which communicate with jacket into the pump cylinder through the openings 20 and 21 respectively.

The bottom of the cooling portion of the casing 4 is designated by the reference numeral 22, said bottom being arranged to cooperate with the end 23 of the casing whereby the exhaust chamber 24 is formed, said chamber being :in communication with the motor cylinder through the exhaustl opening 25.` The pump cylinder as wellv as the enwhich incloses the cooling shaft in which ,may be retained asuitable lubricant to vfacilitate the easy operation of ,the motor. It is to he understood that the motor cylinder is to be provided 'with a suitable sparking plug, fuel ports and other necessary Adjacent to the ports 18 and 19 leading from the cylinder l so as to cause ane 1 to cause it to be cool immediately after'A the explosionhas taken place, The perforate plate will prevent the volume of air from passing through the cylinder 1 on the side only at which the openings 16 and 17 are located, because the aircannot-pass through the perforations, at the side at which the, openings 16 and 17 are located, fast enough lto tilt the cylinder 10l as the piston 11 moves outwardly and, therefore,

the airwillhaxe to find its way into the chamber bottom 20 through the other perforations in the plate, and in doing this it willfpas`s`-en tirely around the cylinder l and thereby act upon the yexterior thereof, so as to carry oft some of the heat. Upon the return stroke of the piston .11, the air which had previ-"` ouslyentered the jacket and Ypassed into the. pumpv cylinder. will be expelled `from the pump through the samev ports through which it ente-red'J whereby it will be forced into the jacket 'and pass over the entire surface of the cylinder 1 to cool it. The pressure in the jacket caused bythe return movement'-ofj the piston 1`1 will be effective in maintainf ing the valve G upon its seat/and equally effective in unseating the valve 3 so that while no air has the opening 5 the air will be permitted-to enter the combustion chamber of the cylin- .der 1 so as to `efliciently scavenge it and force out the burned gases'through the exhaustv port 25'. The relative movements of the pistons 1l and 13` will .be so timedtliat when the pump piston is at approximately the limit of its'inward stroke the motor piston will'be at approximately the limit of .its outward stroke so that the air which has been forced from the 'jacket may be passed through the motor cylinder to remove the` burned gases aswell vas cool the interior surface thereof. A sufficient amount of air willbe maintained within the cylinder 1 when ports 2 and 25 are closed to provide for the proper mixture of air and fuel for the next explosion,y It will be seen therefore that formed by theplate 15 andthe passed into the, jacket iA-through the air Which had previously served as acooling medium, or at least part of it, willl serye as one .of-the component elements of the' motive fluid to impart'the impulse to Ithe motor piston. vArs soon as the motor pison 13 starts on its compression str'oke and has passed the exhaust port 25, the fue] begins'to-become compressed so that the valve 3 will beheld against is seat and further introduction of air Wil' be prevented from entering the cylinder. As soon as the motorpiston begins! its compression stroke the pump piston will begin its intake stroke, so that as soon' as the communication between the air and the interior of lthe cylinder l is cut off,` the valve ,6 will be unseated and the atmosphere will begin to enter the-jaoket 4e in the manner heretofore described..

.In View. of'the fact thatthefopenings 16 and 17 are arranged adjacent the periphery of. the jacket and furthermore in View of. will be dischargedy the A fact that the air fromv both openings at the. same time -so 'as to pass around the motor' eyliriderand then through the perforated ring, it isv obviousthatfthe entire exterior of. the cylin- -der will-be eifectually cooled.

Under certain conditions I may desirable to construct the pump cylinder of sufficient size to enableja larger volume ofy air to be drawn thereinto than can be held under natural -pre'ssure in the lcylinder A1. In the eventthat such vaconstruction isused the -discharge \stroke vof lthe piston' l1 'will' be suflieie'nt to unseat the 'valve 3 'and and. a

force 'the air through saidcylinder 1 underv pressure, so that the air-will have atendfj lency to be. forcedV violently against the inner wall of the lcylinderl 1,1 to 'effectually During this operation the cyl-:

scaveng'e it.

inder will be cooled and la'v suic'ient amount of air will bepermitted to remain in the cylinder 1 to mix with the gas supply preparatory to being compressed and ignited.

lVhat Iclaim is: Y t

The combination with a motor cylinder, of a casing surrounding thesame, a check valve for normally closing a port in the cas' ing, said check valvehaving a tubular stein, a check valve for closing-an opening in thel cylinder and having"y a stem slidable withinthe tubular stem of the casing valve andl means for drawing air into the casing and then introducing 1t into the cylinder.

ln testimony whereof, I hereunto atlix my.

signature, in the presence of two witnesses. ALBERT F. RQCKWELL. lVi'tiies'ses: i

' JosErI-I D.- BnowN,

CL4-Rx H. Voonrrnns. 

